1. To hide the login and register buttons, we suggest that you use our module template to add custom jQuery on page load to hide these links. (We cannot say exactly how to do this as it will be different for different skins). If you are unable to do this yourself, then we can assist you for a small cost.

2. This will be visible by default, as out slide down is only visible for unauthenticated users.

3. No, it must be a module on each page. We recommend the use of the Home page, then tick the option to add to all pages.

4. If you edit the primary instance of the module (home page) then all pages will get the change.

With DNN, there are not multiple pages for each language. There is only the sites defined pages, but the pages can be accessed with a tag or token in the url, telling the pages to load with particular language settings.

So if you have setup the module on your primary page to be accessed correctly with language settings for two languages, then you apply that to every page of your site. Then these settings will apply over all pages of your site.

What you descrive sounds like it may be some sort of cache issue or setup issue, as the module should appear on any page in either language after you make the settings you describe.